https://web.hypothes.is/blog/100000-annotations/

https://hypothes.is/users/heatherstaines<br /> Joined: November 11, 2016<br /> Annotations: 1,063 (public as of 2022-08-12)

Date of publication: 2020-02-07<br /> Duration: 3 yr 3 mo or 1,183 days<br /> Average of: ~100,000/1,183 = 84.53 annotations per day

These would be closer to the idea of fleeting notes per day and not a more zettelkasten-like permanent note. It does provide at least a magnitude of order level of measurement on practice however.

Note that it's possible that as a part of the company she has multiple accounts including one with an earlier born by date which would tend to dilute the average.

The publication is dated 2020-02-07 (which matches publication meta data) and somehow Heather makes an annotation on the post itself (dated 2020-02-02) saying she's already at 105,000 annotations. This could have given a smaller window on a few week's worth of annotations, except for the improbably mismatch in dates.